Hydrocarbon motor



Patented July 8, 1924.

LEWIS C. HILL, OF DETROIT, MICHIGAN', VASSIGJTOR T0 :PACKARD MOTOR CAR COM- PANY, OF DETROIT, MICHIGAN, A CORPORATION OF IMIICHIGAN.

HYDROCARBON MOTOR.

Application filed January 22, 1920, Serial. No. 353,198,

To all whom t may concern.'

Be it known that I, Lnwrs O. HILL, a citizen of the United States, and resident of Detroit,'ll 7ayne Oounty, State of Michigan, have invented certain newand useful Improvements in Hydrocarbon Motors, of which the following is a specification.

This invention relates to hydrocarbon motors and particularly to overhead valve operating mechanisms for such motors.

One object of the invention is to provide an overhead valve construction in which a direct pressure in approximately a straight line is applied from the operating cams to rocker arms between the cams and the valve stems.

Another object of the invention is to provide a construction of rocker arms capable of being pivoted outside of the valves and with the rocker arms on Vopposite sides of the valves extending past one another whereby a single cam shaft common to the opposite rocker arms may be employed, and `a compact arrangement of valve operating mechanism obtained. I

Another object of the invention is to provide a mechanism particularly adapted for constructions in which four valves for each cylin-der of the engine are employed.

Other objects of the invention will appear from the following description.

The invention is embodied in preferable form in the construction and arrangement hereinafter described and illustrated in the accompanying drawings, in which draw-7 1n s:

igure 1 is a vertical cross section through the upper part of a motor showing the improvements herein described applied thereto,

Figure 2, a horizontal section on the line 2 2 of Figure 1, and

Figure 3, a detail perspective of a pair of rocker arms removed from the motor.

Referring to the drawings, 10 indicates a cylinder for an internal combustion engine. In the particular construction of engine herein illustrated and to which this invention is especially adapted, four valves are employed for each cylinder, namely two exhaust valves 11 and two inlet valves 12. These valves are of the overhead type and the stems 13 and 14 of the exhaust and inlet valves respectively are mounted in suitable.

guides 15 which are carried by a detachable head 16 above the cylinder block. These stems have threaded portions 17 adapted to be engaged by nuts 18 each pressing against an annulus or cup 19 which receives the upper end of a spiral spring 20, which spring serves to return the valve to closed position.

Above the valve guide head is detachably mounted a skeleton casing 21 which has spaced vertical webs 22 connecting its lower and upper outer walls and in which webs are mounted the outer ends of rocker arms 23 and 24. These respective rocker arms extend inwardly from opposite sides of the casing and the arms 23 are adapted to operate the exhaust valves of the cylinder while the arms 24 are adapted to operate the inlet valves thereof. The valves are mounted between the pivots of the opposing rocker arms and the contact nuts on the heads of the valve stems project up within the cenj u tral area of the skeleton casing. Each rocker arm 23 is divided into two branch each branch of the Y is a Contact member 25, each-of which is adapted to bear against one of the Contact nuts of a valve stem of one of the exhaust valves. The upper surface of each branch has a flat cam contact face 26 adapted to receive the contact of the cams. The rocker arms 24 which are adapted to operate the inlet valves each have a cam contact surface body 27 which extends between the branches of the opposite arm 23, and T-heads 28 which extend under the branches of the arms 23 and these T-heads are provided with contact parts 29 adapted to bear against the nuts on the upper ends of the valve stems of the inlet valves. Owing to the form, and the overlapping arrangement of the Y and T heads of the opposing rocker arms it will be seen that closely adjacent horizontal surfaces of these respective arms for each cylinder is obtained and on these closely adjoining faces of the arms there is adapted to operate a cam 29 for the central T-head rocker arm and two cam sections 30 for the branches of the Y- liead arm. These cams are mounted upon a single cam shaft 31 extending through the skelet-on casing above the rocker arms. By the provision of the cams above the rocker arms and the location of the pivots of the latter outside of the longitudinal lines passing through the valve stems, with the free llO ends of the rocker arms extending inwardly above the stems 1t will be seen that an approximately direct vertical pressure in a straight line is eXertedby the cams upon the valves, `a T-shaped rocker arm adapted to operate the other set of valves, and-a cam shaft ada-pted to operate both said arms, the stem of the T-shaped arm fitting between the branches of the Y-shaped arm.

2. In combination in a hydrocarbonmotor, two sets of valves, a forked rockerarin adapted to operate one of the valve sets, a rockervarm adapted to operate the other valve set located in part between the branches of theforked rocker arm, and a cam shaft .above the rocker arm having a pair of cams adapted to operate the forked rocker 'arm "and a single cam adapted to operate the other rocker arm.

3. In a hydrocarbon motor, in combina.- tion with la cylinder, valves more than two in number to said cylinder, a pair of rocker armspivoted at the same level on opposite sides of the valves and extending inwardly and disposed in the same plane, one of said arms'overlapping the other, and each of said arms having a plurality of contactparts Y adapted to operate upon said stems, and cam means foi operating said rocker arms.

e. In a hydrocarbon motor, in combination with a cylinder, more than twovalves Vto vsaid cylinder, valve stems,psprings for said valves, a rocker arm pivoted outside Vthe valves andV divided into branches, each having a stem contacting part, and an opposing rocker arm having a central part fitting between said branches in the plane thereof and having a valve stem, contact part extending underrsaid first rocker arm.

In a hydrocarbon motor,in combina.- tion'with a cylinder, fofurvalves to .said cyl inder, a'rock'er arm pivoted at its out-erelid and having two contacts for operating ,two of said valves, a similar rocker armfor the other valves, one ofvsafid arms having a Y- head and the otherhaving a part fitting between the branches ofthe Y-head and having a T-head extending under said branches, cams above said arms, and means forroperating said cams.

V6. InraV hydrocarbon motor, in combina'- tion with valves and their stems, springs Y for said valves, opposite rocker arms pivoted outside of said valves, cams for operat ing said arms, oneof said rockerA arms being divided into branches each Vhaving-a cam contact face and having a plurality of valve i' stem contact parts and the otherA arm having a central partV fitting between the branches in the plane thereo-fand having a cam contact face on said part, and'having valve stem contact means extending transversely below the branches.`

In testimony whereof I aflix'rny signature.

LEwrs c. HILL. 

